One in the car club (6)

I believe the answer is:

driver

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'club' is the definition.
(type of golf club)

I cannot understand how the rest of the clue works.

(Other definitions for driver that I've seen before include "Flat-faced golf club" , "Golf club for long shots" , "See 1 down" , "Golf-club for a motorist" , "Golf club; chauffeur" .)

I've seen this clue in The Telegraph.

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